Hammer down on juvie ills

You can’t use a desk as a weapon if it’s nailed down.

The city is making some modest changes to the Horizon Juvenile Center to quell some of the violence there, including nailing down classroom furniture and frosting windows so teens cannot see — and then attack — passing rivals, officials said Friday.

The aesthetic changes to the Bronx facility were expected to be put in place on Friday, two days after 20 city correction officers were injured in a classroom brawl.

Officials said they plan to bolt down large pieces of furniture so they cant be used as weapons and frost classroom windows that look out into the hallway so inmates don’t see who is being walked down the hallway.

Wednesday’s fight broke out after one group of inmates saw rivals from another hall being escorted down the hall.

The fisticuffs at the Brook Ave., South Bronx facility lasted about two minutes, authorities said.

Injuries suffered by the 16 guards and four captains were minor, sources said.

It was not immediately disclosed how many inmates were injured.

About 100 teens were moved to the Horizon center in from Rikers Island last weekend to comply with the state’s new “Raise the Age” law to treat 16 and 17year-old offenders as juveniles.

Since the doors opened on Friday, there have been more than a half dozen brawls at Horizon, with correction officers — on loan to the city Administration of Children’s Services — critics claim.